Do you know if the SVT/B15 voice selection only applies when the SGT circuit is on? Or does it change the voice of the entire preamp even when it's not?
it only affects the SGT circuit (that I noticed), I flipped the switch through a few settings with only the preamp engaged and it doesn't change anything with the sound.
you can have the SGT very lightly engaged with the grit all the way down and hear tonal changes though, so fwiw you can get subtle changes like that.
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